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PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



the " Skeat Expedition." It bore the name — determined apparently 

 by Mr. Collinge — of Helicarion permoUe, Stoliczka. This was a species 

 I had long wished to dissect, and Mr. Edgar Smith was kind enough 

 to allow me to take a specimen for this purpose. 



1. Leptodontarion Ferakensis. Central teeth of the radula very much enlarged. 



From Natural History Museum specimen. 



2. Jaw. X 30. 



3. Mantle-zone, showing right shell lobe, etc. 



4. Part of the genitalia. 



5. Sitala (?) Gunongensis, u.sp. Central and admedian teeth of the radula. 



Helicarion permolle from Penang Hill is described in the Journal 

 of the Asiatic Society of Bengal, 1873, vol. xlii, pt. ii, p. 18, pi. i, 

 fig. 11 (shell); pi. ii, figs. 21-3 (radula and generative organs). It 

 will be seen that all these characters differ considerably from those of 

 the Perak mollusc, which belongs, in fact, to a different sub-family, 



